scholarly journals Temperature and solids retention time control microbial population dynamics and volatile fatty acid production in replicated anaerobic digesters

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Inka Vanwonterghem ◽  
Paul D. Jensen ◽  
Korneel Rabaey ◽  
Gene W. Tyson
Keyword(s):  
Population Dynamics ◽  
Fatty Acid ◽  
Retention Time ◽  
Volatile Fatty Acid ◽  
Microbial Population ◽  
Fatty Acid Production ◽  
Anaerobic Digesters ◽  
Time Control ◽  
Solids Retention ◽  
Microbial Population Dynamics

scholarly journals Anaerobic digestion of catering wastes: effect of micronutrients and retention time

2008 ◽  
Vol 57 (5) ◽  
pp. 687-692 ◽  
Author(s):  
M. A. Climenhaga ◽  
C. J. Banks
Keyword(s):  
Fatty Acid ◽  
Retention Time ◽  
Volatile Fatty Acid ◽  
Loading Rate ◽  
Ammonia Nitrogen ◽  
Organic Loading Rate ◽  
Micronutrient Supplementation ◽  
Anaerobic Digesters ◽  
Fried Foods ◽  
Prolonged Retention

Source-separated foodwastes collected from a campus catering facility were processed in bench-scale single-stage anaerobic digesters. The feedstock contained a varied mix of fruits, vegetables, meats and fried foods. A constant organic loading rate (OLR) was maintained with differing hydraulic retention times (HRT). Regular addition of trace elements or prolonged retention time allowed stable digestion at high total volatile fatty acid (TVFA) levels. Reactors on HRT of 25, 50, and 100 days with no micronutrient supplementation exhibited methanogenic failure after approximately 40, 100 and 90 days respectively, while duplicate reactors with micronutrient supplementation maintained stable digestion. An extended HRT of 180 days has so far allowed continued digestion (for reactors with and without micronutrient supplementation) at levels of ammonia nitrogen exceeding 5.7 g l−1 and volatile fatty acid levels exceeding 15 g l−1, usually considered inhibitory or toxic.

Volatile Fatty Acid Product Spectrum as a Function of the Solids Retention Time in an Anaerobic Granular Sludge Process

2020 ◽  
Vol 146 (8) ◽  
pp. 04020091
Author(s):  
Michel Mulders ◽  
Angel Estevez-Alonso ◽  
Gerben Roelandt Stouten ◽  
Jelmer Tamis ◽  
Mario Pronk ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Retention Time ◽  
Volatile Fatty Acid ◽  
Granular Sludge ◽  
Anaerobic Granular Sludge ◽  
Acid Product ◽  
Product Spectrum ◽  
Solids Retention Time ◽  
Solids Retention ◽  
Fatty Acid Product
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